Method for controlling generator frequency by output torque of prime motors

Abstract

The invention discloses a method for controlling generator frequency by output torque of prime motors. The method comprises the following steps: A, computing numerical values of rated power PGi of all units, setting the power regulation range of each unit, and determining a numerical value of a load regulation effect coefficient KLD of an electric network load; B, computing disturbance quantity deltaPi of each unit; C, computing the unit regulation power KGi of each unit; D, performing PI (proportion integration) calculation on each unit according to a difference value deltaf of the real-time frequency f and the rated power fN of a system to obtain the power regulation amount deltaPGi of each unit, and obtaining a formula (5): (deltaPGi-deltaPi) / KLD=deltaf in consideration of the regulation effect of a power load; E, according to the rotor motion equation of each unit, obtaining the real-tome output torque TMi of the prime motor of each unit by combining with the formula (5) obtained in the step D, and controlling the output frequency of the system by taking the worked out TMi as the input of each unit. The method disclosed by the invention has the advantages that a frequency-modulated control method is simple and reliable; the automation of the frequency modulation of an electric power system can be realized; the frequency change of the system is rapidly tracked; the human cost is reduced, and the reliability of the electric power system is impoved.

Description

technical field [0001] The invention belongs to the field of electric power system and its automation, and specifically relates to a method for controlling the frequency of a generator by utilizing the output torque of a prime mover. Background technique [0002] Frequency is one of the most important operating parameters of a power system, and frequency changes have an important impact on the safe and stable operation of the system. When the active power imbalance occurs in the power grid, it is extremely important to quickly adjust the system frequency to the rated frequency. Primary frequency regulation and secondary frequency regulation can effectively solve this problem. The primary frequency regulation is to adjust the power output of the generator set according to the system frequency deviation, which can quickly eliminate the frequency fluctuation of the power grid under the action of disturbance. Secondary frequency regulation is to adjust the power-frequency chara...

AI Technical Summary

Problems solved by technology

[0005] What the present invention aims to solve is that the current primary frequency regulation cannot dynamically track the changes of the power grid, and the secondary frequency regulation depends on the synchronizer. If the synchronizer is not installed, manual operation is required, which is likely to cause technical problems such as insufficient frequency regulation technology such as misoperation.

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